<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script src="../js/vue.js"></script>
    <!-- .once 修饰符，页面加载后事件只触发一次，可以阻止事件多次触发行为 -->
    <div id="app">
            <button v-on:click.once="clickBtn">只触发一次</button>
    </div>
       
    <script>
        var vm = new Vue({
            el:'#app',
            data:{     
            },
            methods:{
                clickBtn(){
                    console.log("按钮被点击");
                }
            }
        })

    </script>
    
</body>
</html>